Accessory Structures in Connecticut (2026)
22 rules on the books across Connecticut, 8 cities and counties. Select a rule to read the full details.
Severity: Few Restrictions · Light Restrictions · Some Restrictions · Significant Restrictions · Heavy Restrictions
ADU Rules
Rules for building accessory dwelling units (granny flats, in-law suites) including size limits, parking requirements, and owner-occupancy rules.
Danbury
Significant RestrictionsDanbury opted out of the state's 2021 mandate requiring cities to allow accessory apartments by right, so garage or…
Read full rule →Bethel
Some RestrictionsBethel's zoning regulations allow one accessory apartment per lot, but only inside or attached to the principal house…
Read full rule →Hartford
Some RestrictionsHartford requires a zoning permit before an accessory dwelling unit is recognized, and caps its usable floor area at 50…
Read full rule →New Haven
Some RestrictionsNew Haven allows one accessory dwelling unit per lot in RS-1, RS-2, RM-1, and RM-2 districts, sized 400 to 1,200 square…
Read full rule →Norwalk
Some RestrictionsNorwalk allows accessory apartments only in AAA, AA, A and B Residence Zones, and only inside single-family homes that…
Read full rule →Ridgefield
Some RestrictionsRidgefield permits one accessory dwelling unit per lot with a Zoning Permit, capped at 900 square feet (1,200 if the…
Read full rule →Stamford
Some RestrictionsBuilding a Stamford ADU requires a Zoning Permit, not just a Building Permit; detached units must independently meet…
Read full rule →ADU Owner Occupancy
Whether the property owner must live on-site to operate an ADU, deed-restriction requirements, and recent state-law changes lifting owner-occupancy rules.
Norwalk
Some RestrictionsNorwalk requires the property owner to live on site as a condition of keeping an accessory apartment. Under Code §…
Read full rule →Stamford
Some RestrictionsStamford requires the property owner to live on site before adding an accessory dwelling unit. The Zoning Regulations…
Read full rule →ADU Rental Restrictions
Whether an ADU can be rented short-term (Airbnb), 30-day minimums, separate rental licenses, and long-term lease requirements.
Stamford
Heavy RestrictionsStamford bars every accessory dwelling unit from being used as a short-term rental, full stop. The Zoning Regulations'…
Read full rule →New Haven
Significant RestrictionsNew Haven ADUs are only allowed when the property owner lives on site, and a recorded deed restriction bars ever…
Read full rule →Norwalk
Some RestrictionsNorwalk caps every accessory apartment at 400 to 700 square feet, one bedroom, and three occupants with no more than…
Read full rule →Shed & Carport Rules
When a storage shed or carport needs a permit, the square-footage exemption thresholds, and the setback and height limits that apply either way.
Bethel
Some RestrictionsA shed in Bethel is capped at 400 square feet of footprint and 16 feet in height across every residential zone, well…
Read full rule →Bridgeport
Some RestrictionsBridgeport requires a zoning compliance application before you put up a shed or other accessory building, with an $85…
Read full rule →Danbury
Some RestrictionsSheds and other detached accessory buildings in Danbury's residential districts cannot exceed 15 feet in height or…
Read full rule →Hartford
Some RestrictionsHartford classifies a detached shed as an 'Out Building' under its zoning code, requiring a 5-foot side and rear…
Read full rule →New Haven
Some RestrictionsNew Haven's zoning ordinance treats an attached carport as a building projection, letting it reach into a required yard…
Read full rule →Norwalk
Some RestrictionsNorwalk keeps sheds and other accessory buildings in residence zones off the street-facing part of the lot and away…
Read full rule →Ridgefield
Some RestrictionsRidgefield lets a homeowner build one detached tool or storage shed up to 200 square feet with no Zoning Permit at all…
Read full rule →Stamford
Some RestrictionsA carport in Stamford is regulated as an accessory structure: it must stay out of the front yard, cannot exceed one…
Read full rule →Garage Conversions
Rules for converting a garage into living space, including whether you need to replace the lost parking and what building codes apply.
Tiny Homes
Zoning rules for tiny houses on wheels and foundations, including minimum square footage requirements and where they can be placed.